response to " indigenous peoples, changing social political landscapes .."

In response to the note made by Neel and Salzano that "there is no indian group completely untouched by the discovery of america and subsequent contact, direct or indirect, with the western world" , i believe this could be discussed from another point of view . Yes , these societies one way or another had been exposed to some kind of wester influence , but does this really affect societies that live in primitive cultures and in isolated places in the amazon ?. One could argue that people evolve in accordance to the environment they are exposed to. Western influences would be useless to societies that deal with hunting and survival against amazonian nature. Isolated societies are valuable and 100% useful to human biological development research , which makes this variable irrelevant.